Keystones — Capstone
Five GCSE retrieval questions · 16 November 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: x² + 3x + 5
Answer: (x + 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 60°. Give your answer to 2 decimal places
Answer: 363.73cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 69, 79, 99, 16, 37, 47, 86, 97. Give your answer to 2 decimal places
Answer: Mean = 60.44, Median = 69, Range = 85